Rope-drive elevator.



G. JOHN.

ROPE DRIVE ELEVATOR.

APPLICATION rum) MAR. 20, 1908.

1,102,514, Patented July 7, 1914.

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GRIFFITH JOHN, OF YONKERS, NEW YORK, ASSIGNO'R TO OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ROPE-DRIV E ELEVATOR.

To all whom it may concern Be it known that I, GRIFFITH JOHN, a subject of the King of Great Britain, residing in Yonkers, in the county of VVestchester and State of New York, have invented a new and useful Improvement in Hope- Drive Elevators, of which the following is a specification.

My invention relates to frictional rope drive apparatus, and is particularly adapted to rope drive or traction elevators.

The object of my invention is the provision of simple and eflicient means for moving a load through flexible power transmitting means. l

A further object of the present invention is the provision of a rope drive elevator system bywhich the frictional engagement between the driving member and the flexible power transmitting means will be increased when the load in the car increases.

Other objects of the invention will appear hereinafter, the novel combinations of elements being set forth in the appended claims.

The accompanying drawing illustrates the application of my invention, and shows diagrammatically an electric operating system controllable from the car; but, it should be understood that either electric or any other power may be used, and the controlling system may be varied as desired. In this instance I have shown an electric motor M, to the shaft S of which is connected a driving sheave or drum D.

C designates the car, and V the counterweight.

Mounted on the overhead beam 1 is a sheave 2, from which extends the rope or ropes 3 which are connected at one end to the suspended sheave 4L and at the other end to the upper end of the counterweight W. Another rope or set of ropes or cables 5 are connected at one end to the car C, and at the other end to the counterweight W, these cables passing upwardly from the car C over the suspended sheave 4, thence clownwardly on the under side of the driving sheave or drum D, and finally upwardly to the counterweight W. If desired, instead of having two sets of ropes 3 and 5, there may be only one set of ropes, one end of which is connected to the car and the other to the suspended sheave l, the counterweight W being connected to the ropes between Specification of Letters Patent.

Application filed March 20, 1908.

Patented July 2?, 1914-. Serial No. 422,281.

the sheave 2 and the right-hand side of the driving sheave or drum D.

6 designates controlling apparatus comprising reversing switches, accelerating mechanism, etc, which is controlled by the manual switch 7 in the car such that when the switch 7 is moved to one position, the motor M will operate the power transmitting connections to move the car upwardly, and when the switch is moved to another position the car will be moved downwardly. Although the counterweight may be proportioned with respect to the car and the load as desired, it is preferred that it be such that the tension on the lead 8 will be substantially equal. to the tension on the lead 9 when an average load is in the car C. It is evident that when the car and its load exerts a certain tension on the ropes 3 and 5, tension will be transmitted to the lead 9 and twice this tension will be transmitted to the lead 8. The counterweight W should therefore be such as to relieve this tension on the lead 8 to a sufiicient extent so as to make it substantially the same as that on the lead 9 for an average load. Now, when the load in the car is increased, the tension on the lead 9 will be increased in direct proportion thereto, but the increase in tension on the lead 8 will be twice as great. The load in the car may be increased, however, until the tension on one of the leads is considerably greater than the tension on the other lead before any slipping takes place.

I am aware of the system of rope drive for elevators invented by Michael E. Neenan, and covered in his application for Letters Patent, Serial No. 365,705, filed April 1, 1907, for an improvement in elevators, but I regard my arrangement as an improvement thereover in lessening the number of sheaves. In the Neenan construction referred to there are two sheaves on fixed bearings and one mounted on the counterweight besides the driving sheave, the driving ropes extending from the car upwardly over the overhead sheave, downwardly un der the counterweight sheave, thence upwardly over another overhead sheave, thence downwardly under the driving sheave, and finally upwardly to the counterweight. In my arrangement the sheave on the counterweight is eliminated.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of my invention, and I desiretherefore not to be limited to the precise construction disclosed. I

Having thus fully described my invention, what I claim and desire to have protected by Letters Patent of the United States is 1. The combination with a load carrying device, of a motor, and power transmitting means comprising a cable, a weight connected to said cable, a traction driving sheave or drum and only two additional sheaves, and a stationary support for one of said additional sheaves, the other of said addi tional sheaves being suspendedfrom the cable and supporting the load carrying de- Vice. 7

2. In an elevator, the combination of a car, a motor, a driving sheave or drum, flexible power transmitting means connected to the car and associated with said driving sheave, a weight connected to said means, and only two additional sheaves associated with said means, one of said additional sheaves being carried by said power trans mitting means and carrying the car.

3. In an elevator, the combination with a car, of a motor, a driving drum, a single sheave mounted on fixed bearings, a loose sheave, a weight, a rope or ropes associated with said first named sheave and connected at one end to said loose sheave and at the other end to the weight, and an additional rope or ropes connected at one end to the car and at the other end to said weight, with its intermediate portion associated with said loose sheave and said driving drum. 7

4:. In an elevator, the combination with a car and a counterweight, of a motor, a sheave journaled in stationary bearings, a driving drum connected to the motor, a loose sheave, flexible power transmitting means connected to the car, counterweight, and said loose sheave, said jpower transmitting means extending upwardly from the car over said loose sheave, downwardly under the driving drum, and upwardly from the counterweight. over the fixed sheave to the loose sheave.

5. In an elevator, thecombination with a car, of a motor, a driving sheave, a flexible member forming a direct connection between said car and one side of said sheave, a movable pulley with which said flexible member engages, a connection between said pulley and the other side of said driving-sheave,

and'a weight for reducing the tension of the lead on said otherside of the driving sheave. 6. In an elevator,'the combmation wlth a car, of a motor, a driving member,-a rope or ropes connected to the car and associated with said driving member, a weight connected directly to one of the leads extending from said driving member, a single sheave afi'ording a direct connection between the car and the other lead extending from said driving member, a rope connected between said sheave and said weight, and a single sheave associated wlth sald rope.

7 In an elevator, the combination with a car, of a motor, controlling apparatus for said motor, a driving drum or sheave con nected directly to the motor shaft, an overhead sheave mounted-on stationary bearings,

a loose sheave, a weight, a rope or ropes con- I nected at one end to said loose sheave to suspend the same and at the other end to said weight, the intermediate portion of said rope extending over the overhead sheave, another rope or ropes connected at one end to the ear and at the other end to said weight, with its intermediate portion extending over said suspended sheave and under said driving sheave. I

In testimonywhereof, have signed my name to this specification. in the presence of two I subscribing witnesses.

. v GRIFFITH JOHN. Witnesses: a V

D. L. HoKRoN, C. BLUM; I

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, *D. vG. I 

